Bad to leave games sitting in the wii when it's off?

My brother was reading his Wii manual, and it says it's not good to leave a disc in the system when its not being used... What the heck is that all about, I mean... The controller has a power button for a reason, so I don't have to get up! Does this mean I have to walk allllll that way to my Wii to take the disc out each time I turn it off, and put the game back in everytime I want to play??? SHATTY DEAL

My brother was reading his Wii manual, and it says it's not good to leave a disc in the system when its not being used... What the heck is that all about, I mean... The controller has a power button for a reason, so I don't have to get up! Does this mean I have to walk allllll that way to my Wii to take the disc out each time I turn it off, and put the game back in everytime I want to play??? SHATTY DEAL

Considering how bullet proof all nintendo products have been in the past I'm pretty sure that ultimately my system won't kerplode because I leave the game sitting in it.. THe only fear I really have is that either the disc will get scratched somehow by maybe the system being bumped on the desk without it running... or, that maybe when the system is on standby something funky and magnetic is going on that could wreck the CD. Neither of these seem reasonable to me so screw this, I'm gonna ignore nintendo on this one!